Random bots joining and instantly leaving my server

Im not sure why or how, but so far 4 accounts have gotten the IP to my private server, joined, and instantly left. I have no idea why or how this is happening if theres anything like a plugin or something doing it I would just want to know im not getting like exploiters on or something.

the plugins i have are Dynmap, Gsit, OnePlayerSleep, SimpleHomes, and StormerTPA

very confused
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